Astro-skeleton demo of planisphere @MarkFrankclocks
Astro-skeleton demo of planisphere  @MarkFrankclocks
Uploaded July 2018 | Updated September 2026, 2 weeks ago
This video shows an example of where the sun would be in the sky during the summer solstice at latitude 42 degrees North, Chicago Illinois, USA. One can see the sun emerges from the horizon mask on the left and disappears below on the right far below where the arm holding the sun is below a horizontal position resulting is the longest day that the sun is above the horizon. The opposite will be true at the winter solstice where the sun will intersect the mask when the arm is above a horizontal position.
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Mark Frank |

Astro-skeleton demo of planisphere

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